I'll be honest here and tell you know - if you want work in Ibiza you have to be there. Get your face in and ask about - you will get something as there is a high staff turnover.
Please let me tell you one thing though (I'm not trying to put you off).
Remember - working out there is a different ball game. It wont be all all parties - you will be expected to work and work hard for probably not a lot of money. A lot of people go over there expecting it to be like one big holiday but it isnt.
Also , you will be working and living within a group of people - more like a community. which isnt a bad thing but you get all the normal gossip e.t.c.
BUT - on the up side - if you go with the right attitude , make friends and take enough money to get you started and budget with what you actually earn you can have the best time of your life.
Hope I didnt put you off - just some honest advice.